1 files changed, 4 insertions, 0 deletions
diff --git a/test/io.rb b/test/io.rb
index 727c67303..315f3ea79 100644
--- a/test/io.rb
+++ b/test/io.rb
@@ -232,6 +232,10 @@ assert('IO#fileno') do
   io.closed?
 end
 
+assert('`cmd`') do
+  assert_equal `echo foo`, "foo\n"
+end
+
 assert('IO TEST CLEANUP') do
   assert_nil MRubyIOTestUtil.io_test_cleanup
 end